ABSTRACT
A unifying theme tying together many of these N dependences is that longitudinal diffusion often controls dispersion in MEKC. This fact has been recognized earlier [4,5]. However, only recently have subtleties of behavior been attributed to longitudinal diffusion, because such attributions required a quantitative theory of N. For example, both the increase of N with increasing retention factor in buffers containing no hydrophilic organic modifier, and the decrease of N with increasing retention factor in buffers containing hydrophilic organic modifier, result from longitudinal diffusion, at least in the surfactant, sodium dodecyl sulfate (808).
